Improvement in saw-jointers



E. GUWDYQ Saw-Jo inters.

No. 147,631. Patented Feb. 17.1874.

WITNESSES: INV TUB:

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UNITED STATE$ PATENT Orrrca.

EDWIN cownr, on PETTISVILLE, orrro.

IMPROVEMENT IN SAW-JOINTERS.

Specification forming part of Letters Patent No. 1 12631, dated February17, 1874 application filed December 6, 1873. 7

To all whom it may concern:

Be it known that I, EDWIN Gownr, of Pettisville, in the countyof Fultonand State of Ohio, have invented a new and Improved Machine for DressingSaws, of which the follow ing is a specification:

In the accompanying drawing, Figure 1 represents a side view of myimproved machine for dressing saws, as applied to a circular saw. Fig. 2is a sectional plan view, and Fig. 3 is an end view, of the same.

Similar letters of reference indicate corresponding parts.

The object of my invention is to provide for the use of sawyers animproved machine for dressing and truing the teeth of circular and othersaws, by which the operation is accomplished in a rapid and accuratemanner. The invention will first be fully described, and then pointedout in the claim.

In the drawing, A represents the base or guide piece, which is securedin suitable manner to the saw-frame, so that the fileholding frame orcarriage B may be instantly applied for use or withdrawn, as required.The fileholder B is carried backward and forward by a screw, a, whichturns in bearings 11 of base A, and acts on the socket (1,. applied tothe bottom of the file-holder which socket runs in suitableguide-grooves d of basepiece A. The fileholder B consists ofa U-shapedframe, with adjustable screws 0 at the front ends of the parallel legs,which screws project toward the inside for guiding the saw steadilybetween them. Three files, O, are secured to the inside of the rear partof file-holder B, one being placed vertically to the legs in grooves fof the same, the two other files being set in'recesses f, parallel tothe legs back of cross-file G. The files U are firmly retained in thefileholder B by means of a wedgeshaped key, D,

and washers g. The parallel files G are ads justed nearer or wider bysupporting set-screws h, according to the thickness of the saw to befiled. The front file O and rear washer g are made of wedge shape, andadjusted by means of screws i, which pass through the end of fileholderB, and produce the square setting of the files. A central guide-screw,1, passes also to the roar of file-holder B, and through rear washer g,to key D, binding thereby the key and files firmly together. 7

After the teeth of the saw have been swaged, so that the teeth arespread a little more than necessary for use, and the shorter teethraised sufficiently to strike the first file, the file-holder isadjusted on the. saw so that the same runs steadily between the endscrews. By turning, then, the saw backward the first file acts as a gageand file on the circumferential edge of the teeth; gives a true edge,and dresses them smoothly and evenly. The key is then loosened and takenout with the front file and washer. The file-holdcr is then screwedforward and the side files adjusted to the saw, which is then passedseveral times along the same until the rough side edge of the teeth istaken off, and a perfectly smooth and square edge is produced. Thefile-holder is then can ried back, requiring, after being once set, butlittle adjustment, which is, however, easily obtained by detaching thesliding file-holder and adjusting the bottom set-screws. The saw, whendressed in this manner, will cut evenly and quickly through the wood,and produce a smooth quality of lumber.

Having thus described my invention, I claim as new and desire to secureby Letters Patcut- The machine for dressing saw-teeth, consisting ofbase-piece A, with longitudinal screw to for carrying thereon thefile-holder B, with files O, secured firmly therein by key D and washersg, and arranged and operating substantially in the manner and for thepurposes set forth.

EDWIN G'OWDY. Witnesses:

WILLIAM I. Fosrnn, DANIEL J. WALTER.

